Out-of-bounds read in Linux kernel - CVE-2026-31782

Vulnerability identifier: #VU128916

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-31782

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in intel_pmu_set_acr_caused_constr when handling groups of events that include software events during auto counter reload. A local user can trigger this condition to disclose sensitive information.

The issue occurs because a software event PMU may be processed through the hybrid helper path even though it is not an x86 event.

Linux kernel
openEuler
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel-extra-modules

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
python3-perf-debuginfo - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
python3-perf - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
perf-debuginfo - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
perf - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-tools-devel - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-tools-debuginfo - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-tools - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-source - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-headers - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-devel - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-debugsource - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-debuginfo - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
bpftool-debuginfo - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
bpftool - addressed in versions 6.6.0-145.0.9.136, 6.6.0-145.0.9.140, 6.6.0-145.0.9.148
kernel-extra-modules - update to 6.6.0-145.0.9.140

• https://git.kernel.org/stable/c/bfee04838f636d064bc92075c65c95f739003804
• https://git.kernel.org/stable/c/dbde07f06226438cd2cf1179745fa1bec5d8914a
• https://git.kernel.org/stable/c/e435a30ca6fe14c9611b1fc731c98a6d28410247

• Out-of-bounds read in Linux kernel events intel
• openEuler 24.03 LTS SP1 update for kernel
• openEuler 24.03 LTS update for kernel
• openEuler 24.03 LTS SP3 update for kernel